Scotland at the beginning of the nineteenth century. Scoggie Castle is cold and grim, but a refuge to the disinherited Charles Murray. Then a series of mysterious deaths shakes family and servants alike, and splits the local village in two. Murray is thrown once more into the midst of murder, but who has the answer in this dark rural landscape - the pig-lovers or the pig-haters? Knowledge of Sins Past is second in the Murray of Letho Series.